Data as of Oct 28, 2026.
IMCB vs RSP: Differences, Returns & Fees
Over the year to Oct 28, 2026, IMCB returned +19.9% to RSP's +16.0%; 54% of their weight is in the same names.
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Net assets: $1.7bn on Oct 28, 2026 for iShares Morningstar Mid-Cap ETF, and $99.8bn on Oct 27, 2026 for Invesco S&P 500 Equal Weight ETF.
Pair scorecard
IMCB costs 0.16 points a year less; their one-year returns differ by 3.9 points; RSP is far larger, $99.7bn against $1.7bn.
| Measure | IMCB | RSP |
|---|---|---|
| Return | ||
| Total return, 1 year | +19.9% | +16.0% |
| Benchmark | ||
| What it tracks | Morningstar US Mid Cap Index | S&P 500 Equal Weight Index |
| Cost and size | ||
| Expense ratio | 0.04% | 0.20% |
| Net assets, as of Oct 26, 2026 | $1.7bn | $99.7bn |
| Holdings | ||
| Holdings in common | 54% | |
| Top ten holdings, share of the fund | 7.7% | 2.7% |
Holdings in common uses holdings dated Oct 27, 2026. Method
What they share
By the books each fund has filed, IMCB and RSP hold 54% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
54% in common
Only in one fund ↓
Side by side
IMCB and RSP on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IMCB and RSP do different jobs. What does each one do in a portfolio?
- What each follows. IMCB follows Morningstar US Mid Cap Index and RSP follows S&P 500 Equal Weight Index.
- One-year total return. Over 1 year to Oct 28, 2026 IMCB returned +19.9% and RSP +16.0% with distributions reinvested, a gap of 3.9 points.
- Cost. IMCB charges 0.04% of assets a year and RSP 0.20%, a gap of 0.16 points.
Data as of Oct 28, 2026.
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IMCB
IMCB tracks an index. Over the year to Oct 28, 2026 it returned +19.9% with distributions reinvested. The prospectus expense ratio is 0.04% a year. By its holdings published by its issuer for Oct 27, 2026, 86% of the fund by weight is stocks the S&P 500 also holds, across 394 positions, with the top ten at 7.7%.
RSP
RSP tracks the S&P 500 equal weight. Over the year to Oct 28, 2026 it returned +16.0% with distributions reinvested, against +13.7% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.20% a year. By its holdings published by its issuer for Oct 27, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 508 positions, with the top ten at 2.7%.
Questions people ask
- Which returned more over the last year, IMCB or RSP?
- In the year to Oct 28, 2026, with distributions reinvested, IMCB returned +19.9% and RSP +16.0%.
- Which is cheaper, IMCB or RSP?
- IMCB is cheaper, by 0.16 percentage points a year. That is about $16 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, IMCB against RSP, data as of Oct 28, 2026. https://etfiq.com/compare/any/imcb-vs-rsp
ETFIQ. (Oct 28, 2026). IMCB against RSP. Retrieved from https://etfiq.com/compare/any/imcb-vs-rsp
[IMCB against RSP (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/imcb-vs-rsp)
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